1311239 has 2 divisors, whose sum is σ = 1311240. Its totient is φ = 1311238.

The previous prime is 1311229. The next prime is 1311241. The reversal of 1311239 is 9321131.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1311239 - 2⁴ = 1311223 is a prime.

It is a Sophie Germain prime.

Together with 1311241, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1311239.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1311229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655619 + 655620.

It is an arithmetic number, because the mean of its divisors is an integer number (655620).

2^1311239 is an apocalyptic number.

1311239 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311239 is an equidigital number, since it uses as much as digits as its factorization.

1311239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 162, while the sum is 20.

The square root of 1311239 is about 1145.0934459685. The cubic root of 1311239 is about 109.4529033022.

The spelling of 1311239 in words is "one million, three hundred eleven thousand, two hundred thirty-nine".